Drill sharpener



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DRILL SHARPENER Filed Jan. 24, 1951 8 Sheets-Sheet 1 Fig. 1

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DRILL SHARPENER I Filed Jan. 24, 1931 8 Sheets-Sheet 5 INVENTOR.

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DRILL SHARPENER Filed Jan. 24, 1951 s Sheets-Sheet 6 1 N VEN TOR.

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DRILL SHARPENER Filed Jan. 24, 1951 8 Sheets-Sheet '7 y 1935- Y G. c, PEARSON 2,001,689

f I I bRILL SHARPENER Filed Jan. 2 1951 8 Sheets-Sheet 8 gwuentoc g2 .Ciwriau Cffhzrwo/L Patented May 14, .1935

UNITED STATES PATENT OFFICE DRILL SHARPENER Application January 24,

'7 Claims.

The present invention relates to improvements in metal working machines, and is more specifically directed to pneumatically operated machines for shaping and sharpening drill steels.

The main object of the invention is to provide a motive fluid operated machine, the exhaust from which enters a chamber where it is permitted to expand and dissipate prior to its admission to atmosphere.

Another object of the invention resides in the provision of a motive fluid operated machine for forging a drill steel and holding the steel in a clamping position while it is being worked upon by a second fluid operated tool, the exhaust from both tools passing into a chamber where it is broken up prior to its admission to atmosphere.

A further object of the invention lies in the provision of a motive fluid actuated sharpener comprising a forging cylinder and a clamping 20 cylinder, both of which are provided with a common piston, and means for admitting motive fluid into both cylinders, either independently into the forging cylinder or simultaneously into both. A second fluid operated tool is provided for upsetting the work held in the sharpener during its clamping operation, and the admission of motive fluid to this tool being supplied from the clamping cylinder.

Further objects of the invention will herein- 30 after appear, and to all of these ends the invention consists of the features of construction, ar-

rangement of parts, and combination of elements substantially as hereinafter fully described in the specification, claimed and shown in the accompanying drawings in which:

Figure l is a front elevation of a sharpener embodying the improvements hereinafter described.

Figure 2 is a side elevation of the sharpener illustrated in Figure 1, and showing the control 40 Valve, together with a fragmentary portion of a fluid operated work engaging tool positioned thereon.

Figure 3 is a vertical sectional view on the line 3'3 of Figure 2. I

Figure 4 is a side elevation of the sharpener showing partly in elevation and section the major portion of its operated elements.

Figure 5 is a horizontal sectional view on the line 55 of Figure 2.

Figure 6 is a horizontal sectional view on the line 66 of Figure l. v

Figure 7 is a top plan view of the sharpener base.

Figure 8 shows a side elevation of the sharpener 1931, Serial No. 510,980

cylinder, showing that portion of the cylinder to which the control valve is secured.

. Figure 9 shows a fragmentary portion of the drill sharpener with the fluid operated work engaging tool mounted thereon.

Figure 10 is a sectional view on the line Ill-I0 of Figure 9.

Figure 11 is a. vertical sectional view on the line I l'll of Figure 5 showing the main passage for motive fluid leading from the valve to the upper face of the large or forging piston.

Figure 12 is a View somewhat similar to Figure 11 but taken on the line I 2-42 of Figure 5, showing the passage for air leading from the valve to the upper face of the smaller or clamping piston,

and

Figure 13 shows in section a fragmentary portion of the main cylinder with the exhaust passage formed therein and communicating with a similar passage in the base.

Referring to the drawings in detail, the numeral 7 14 indicates a cylindrical base including a bottom wall I 5 and an outwardly extending annular flange l6,ha ving at spaced intervals thereabout openings H for the reception of bolts, by which the base can be attached to a suitable founda tion. Disposed horizontally within the base I4, and approximately midway thereof is a wall N3, the central portion of which is provided with an upstanding cylinder :9, the upper end being connected by a second horizontal wall 20 to the upper end of the cylindrical wall of the base. The structure thus described serves to divide the base into two chambers 2| and 22, the former constituting a motive fluid reservoir, While the latter is substantially annular, as shown in Figure '7, and constitutes an exhaust receiving chamber which will be' hereinafter more fully described.

Within the chamber 22, and formed integrally with the wall I8 and the cylinder I9 is an upwardly extending brace 23 serving as a reinforced element for the structure, and at the same time constituting a baffle wall. Positioned approximately diametrically opposite to the brace or bafile wall 23 is a second wall '24 extending from the lower wall l8 to the .upper wall 20 and closing the annular compartment at that point. The upper wall 20, as shown in Figure 7, is provided with diametrically opposite openings 25, the purpose of which will be described more fullyhereinafter.

The lower chamber or reservoir 2| receives motive fluid brought to the. machine and delivered to a nipple 26 screwed into a supply passage 21 opening into the reservoir.

The top of the base I4 is provided with an outstanding flange 28, having at spaced intervals openings 29, and positioned upon the flange and secured thereto by side bolts 30 which pass through the openings 29 is a cylinder 3|. The bolts 30 are enclosed within vertical ribs formed exteriorly of the cylinder wall. This cylinder 3| has in its lower portion a vertical disposed piston chamber 32, and above the chamber 32 there is formed in the cylinder an upper piston chamber 33 of less diameter than the piston chamber 32, and having direct connection therewith. I

Movable vertically in the piston chambers 32 and 33 is a stepped piston body 34, preferably of a single piece, the lower and larger diametrical portion 35 of said body operating in the chamber 32, and having a fluid pressure surface. The smaller and upper portion of the body forms a piston 31 that operates in the smaller piston chamber 33 and has an upper pressure surface 33. These fluid pressure surfaces 36 and 38 may be referred to as primary and secondary areas, respectively. Formed centrally of the lower face of the piston body 34 is a depending piston 39 operating within the upstanding cylinder IS. The piston 3! acts in opposition to the pistons 35 and 31 as its lower face is constantly engaged by motive fluid contained in the chamber 2 Mounted on the top of the cylinder 3| is a cylinder head 40, secured to the cylinder and base by the side rods 36 and constituting what will hereinafter be referred to as a lower die block. The die block 43, as shown more particularly in Figures 1, 3 and 4 is provided with a plurality of die seats, one of which is shown at 4| for the reception of a suitable die, shown at 42 in Figures 1, 3 and 4.

The die block 40 is provided with a rearwardly extending arm or bracket 43 which constitutes a support'for a fluid operated dolly hammer 44, having at its front end a work engaging dolly 45.

Over the head 40 is a movable die block 46, the underface of which is provided with a plurality of die seats, one of which is shown at 41 to receive a die 48 intended to co-act with die 42 positioned upon the head 40. The movable head 46 is mounted upon theends of spaced bolts 49, slidably mounted in the head40, and have their lower ends fixed in the piston body 34. Spacing sleeves 50 on thebolts 49 are interposed between the upper piston surface 36 and the movable die block 46, thereby maintaining in a fixed relation the movable die block to the piston body 34.

Motive fluid from any suitable source is brought to the machine and delivered through the nipple 26 into the supply passage 21 formed in the rear of the base and opening into the reservoir 2|. Motive fluid thus supplied acts against the lower face of the'piston 39 to move it, and the die block 46 connected thereto, upwardly. Formed in the wall of the base I4 is an upwardly extending passageway communicating with a second passageway 52 formed in the wall of the cylinder 3| and leading to an annular chamber 53 formed around a removable valve cage 54, pressed into a valve casing 55 which is detachably connected by bolts 53 to a flat surface'51 formed upon the side wall of the cylinder 3|. At one side of the chamber 53 is an annular groove 53, and beyond the groove 58 is a second annular groove 59, all being clearly disclosed in Figure 5. The groove 58 as shown in Figure 11 communicates with a vertical passageway 60 formed in the wall of the cylinder 3|, opening into the top of the piston chamber 32, permitting motive fluid when passing therethrough to impinge upon the pressure engaging surface 36 constituting the upper face of the piston 35. The annular groove 59 as shown in Figure 12 is in communication with a second passageway 6| which opens into the top of the smaller piston chamber 33 above the pressure surface 38 of the piston 31. The annular chamber 53 and grooves 58 and 59 have communication with the interior of the valve cage 54 through ports 62.

To control the distribution of motive fluid from the annular chamber 53 to the grooves 58 and 59 there is positioned within the cage 54, f0r slidable movement, a plunger valve 63 having a centrally reduced neck 64, and end heads 65. The valve 63 is connected by a link 66 to a hand actuating lever 61 fulcrumed at its lower end as shown at 63 to a depending bracket 69 made integral with the valve casing 5.5. To prevent the accidental movement of the hand lever there is provided an encircling guard 18 which is secured to the machine by the bolts 56 serving to connect the valve casing 55 thereto. The guard 16 has pivoted to its front portion a hook 1| which is adapted to engage a pin 12, carried by the lever 61, for holding the lever and valve in an off position.

Communicating with the interior of the smaller piston chamber 33 is a passageway 13, having screwed therein a nipple 1-4 which extends throughrthe wall of the cylinder 3|, as shown in Figural), and has connected thereto a'flexible conduit 15 leading to the intake port 16 of the dolly hammer cylinder, mounted upon the outer end of the bracket 43. It will be observed from Figure 9 that the passage 13 opens into the interior of the piston chamber 33, and it will thus be evident that when motive fluid is admitted into the cylinder, through the movement of the control valve 64, it will be simultaneously admitted into the dolly hammer cylinder, thus setting this unit into operation and performing its intended work upon the steel. This arrangement permits the operation of the dolly hammer only at such periods as when the steel or work is aecurely clamped by both pistons 35 and 31.

As shown in Figure the supporting bracket 43 for the dolly hammer cylinder has its upper face concaved longitudinally, as shown at 16 to receive the convexed fact 11 of the dolly hammer cylinder base. The base 11 is provided on opposite sides wlth longitudinal flanges 13, the

upper faces of which are engaged by hooked ends 19' of a yoke member 80, resiliently connected to the bracket 43 for vertical movement by bolts BI, and locked in its lowermost position by a locking screw 32. With this structure all that is necessary to move the cylinder 44 longitudinally of the bracket 43, is to loosen the locking screw 82, and by reason of the resilient connections. formed by the bolts 8|, the yokellll will be moved upwardly, thus releasing the binding action upon the flanges 18 of the dolly cylinder base. I

Assuming that motive fluid is supplied to the reservoir it will be evident by referring to Figures 3 and 4 that it has constant access to the interior of the upstanding cylinder l9, and there.- fore constantly bears against the lower face of the piston'39 to move it upwardly. The diameter of the piston 39, when acted upon by the mo' tive fluid, is sufficient to move with it the piston body 34 and the upper die block 46. Should the control valve 63 be in its closedposition, motive fluid passing from the reservoir 2| through the passages 5| and 52 to the annular chamber 53, is held against distribution to the various ports formed in the valve casing by the head of the valve. However, should the valve 63 be moved to the position shown in Figure 5, then motive fluid is permitted to how from the annular chamber 53 through the ports 62 around the reduced neck 64 of the valve and through the ports 62 of the valve cage into the annular groove 58 from which it passes through the passageway 60 into the lower or larger piston chamber 32 where it engages the upper pressure surface 36 of the piston 35, moving the piston body downwardly, and at the same time moving the movable die block 46 down into coacting relation with the lower die block 49. Due to the enlarged area of the pressure engaging surface 36 over that of the return piston 39, fluid will move the piston body 34, and the die block 46, down into-contact with the lower die block 40 for forging and shaping the work. Leakage of motive fluid past the piston 35 is permitted to escape through the opening 25, arranged in the wall 20, into the chamber 22 and finally to atmosphere as will be apparent later on in the description. By rapid reciprocation of the valve within certain limits, and sufiiciently to form connection between the chamber 53' and the groove 58, and alternately open the groove 58 to atmosphere through the end of the valve as hereinafter described, the upper die block can be made to reciprocate rapidly so as to assist in the forging or shaping operation of the work.

If it is desired to clamp firmly the steel or work between the stationary die block 48 and the movable die block 46, so that it might be acted upon by the dolly 45, actuated by the hammer 44, the valve 63' is moved to the third of its operating positions, thus permitting the flow of motive fluid from the annular chamber 53 through the ports 62, around the reduced neck 64 of the valve, and through the ports 62 to the second annular groove 59 from which it passes through'the passageway 6|, as shown in Figure 12 to the upper face of the smaller piston 39 impinging upon the pressure surface 38, thereby giving to the piston body 34 the maximum downward pressure equivalent to the pressure of the fluid bearing upon both piston areas 36 and 38. Simultaneously with the admission of motive fluid into the chamber 33, a portion passes therefrom through the passageway 73, conduit 15 and to the dolly hammer 44, Setting it into operation to act upon the work clamped between the two die blocks. Upon the movement of the actuating lever 61 to the left the valve 63 is, of course moved, and as it moves backwardly the supply of motive fluid to the annular groove 59 is cut off, and as the head 65 of the valve 63 moves over the groove it is obviously opened up to atmosphere, thus permitting the exhaust of motive fluid from the piston chamber 33. A further movement of the valve 63 permits the exhaust from the piston chamber 32 to pass to atmosphere in a like manner. Upon the completion of the exhaust from both chambers 32 and 33, the piston 39 is permitted to react and elevate the body piston 34 and the upper die block 46.

To muffle the exhaust passing out of the cylinders 32 and 33, together with that from the dolly hammer 44, the chamber 22 formed in the base M, is used as an exhaust chamber into which the exhaust is admitted and permitted to expand prior to its admission to atmosphere.

As shown in Figures 3, 6 and '7 the chamber 22 is provided with an exhaust inlet 84, and an exhaust outlet 85 adjacent thereto, but separated therefrom by the wall 24 which is formed in the chamber. It is evident that upon the ad'- mission of the exhaust through the inlet 84 it enters into the large chamber 22 where expansion takes place, thus breaking it up sufficiently to mufile the sound prior to its admission to atmosphere. After the exhaust has entered into the chamber 22 it seeks its way around the annular chamber and out to atmosphere through the port 85 in the rear of the machine.

Extending upwardly through the wall of the base i4 is a passageway 66 which communicates with a similar passageway 87 formed in the wall of the cylinder 3|. This vertical passageway 81 communicates intermediately of a horizontally disposed passageway 88 formed within the wall of the cylinder 3|, one branch of which 89 leads to an exhaust chamber 96 formed in the valve casing 5 and in the rear of the control valve. The other branch 8| communicates with a second vertically disposed passageway 92 likewise formed in the wall of the cylinder 3|. This passageway 92 is in communication with a passageway 93 formed within the bracket 43, opening into an exhaust chamber 94 formed in the base of the dolly hammer cylinder 44, and into which exhaust from the hammer cylinder is permitted to pass during its operation.

From the foregoing it will be evident that durpassageways 93, 92, 9|, 81 and 86, where it enters r the exhaust chamber 22 through the port 84, whereupon it will be broken up prior to its admission to atmosphere through the outlet port 85. In the operation of the sharpener it will be evident that when the control valve 63 is moved to such a position as to permit the motive fluid within the piston chambers 32 and 33 to exhaust, this waste fluid will pass thru the rear of the valve cage into the chamber 99, from which it flows to the horizontal passageway 89 and into the vertical passageways 8'! and 86, where it enters the chamber 22 thru the port 84. Upon its entrance into the chamber 22 it will be broken up prior to its admission toatmosphere in a manner herebefore described. By reason of this opening 25 formed in the upper wall 20 of the chamber 22 the exhaust during its expansion period passes through the openings and engages the under face of the piston body 34, therefore assisting the piston 39 in its return of the die block 46 to its elevated position.

To lubricate the machine the chamber 2| not only serves as a reservoir for motive fluid, but as a lubricant container, and in view of the elevated position assumed by the supply passage 21, lubricant may be placed within the reservoir through a filling opening closed by a plug I95 until it assumes a level indicated by the line A in Figure 4. To saturate the incoming motive fluid there is provided a nozzle 95 which extends vertically and transversely of the passageway 21. The nozzle is provided with suitable passages so that as motive fluid passes around its body a suction may be created through its various passages thereby drawing up lubricant from the bottom portion of the reservoir. Motive fluid thus saturated with lubricant passes upwardly to the control valve and hence into the several piston chambers and dolly hammer cylinder, depositing in each a sufficient quantity of lubricating oil.

As shown in Figure 3 it will be observed that iii the bottom wall l of the base is slightly inclined, and at its lowermost portion there is provided a drain opening 96, closed by a removable plug 91. To provide sufiicient oil upon the bolts 49 which connect to the piston body 34 and extend upwardly through the die block 40 the upper face of the movable die block 46 has formed centrally thereof a lubricant well 98, closed at its upper end by a plug 99. The lower end of this well 98 has communicating therewith a plurality of upwardly diverged passageways I00 which serve to convey lubricant from the well 98 to the rods 49, where it ultimately passes down and lubricates ,Suflioiently the wearing surfaces of the rods and sleeves 50.

From the foregoing it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art without further description, and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to without departure from the spirit or sacrificing any of the advantages of the invention.

What I claim is 1. In a metal working machine, a base and a fluid actuated work engaging element thereon, means controlling the flow of fluid to and the exhaust from said element, an exhaust expansion chamber within the base receivingthe exhaust from said element, said element being adjacent to and in communication with said chamber, and said element being actuated partly by the exhaust during its expansion period.

a 2. In a metal working machine, a base, a fluid operated work engaging element thereon, having a plurality of movements, said base having an exhaust expansion chamber open to atmosphere, means conducting the exhaust from the element to the chamber, said exhaust chamber being in communication with the element, and saidelement being acted upon in one of its movements by the exhaust during its expansion period.

3; In a drill sharpener, the combination of a base forming a motive fluid reservoir, an exhaust receiving chamber within the base open to atmosphere, a workengaging element on the base, said element having therein a movable member in communication with the interior of the exhaust chamber, means controlling the supply of motive fluid to the element and the exhaust therefrom to the chamber, and said movable member being assisted in its movement by the exhaust during its expansion period within the chamber.

4. In a drill sharpener, the combination of a base forming a motive fluid reservoir, an exhaust receiving chamber within the base open to atmosphere, a work engaging element on the base, said element having therein a movable member in communication with the interior of the exhaust chamber, a second fluid actuated work engaging element on the base, means controlling the supply of motive fluid from the reservoir to both elements, and the exhaust from one to the chamber. the other element exhausting directly into the chamber, and said movable member being assisted in its movement by the exhaust from both elements prior to its admission to atmosphere.

5. In a metal working machine, the combination of a base and a fluid actuated work engaging element thereon, means controlling the flow of. motive fluid from the base to said element, a chamber open to atmosphere and receiving the exhaust from said element, said element being in communication with the exhaust receiving chamber, and the operation of said element being influenced by the exhaust within the chamber prior to its passage to atmosphere.

6. In a drill sharpener, a base having therein a fluid reservoir and an exhaust receiving chamber positioned one above the other, an upstanding cylinder within the exhaust receiving chamber and having open communication with the reservoir, a work engaging element positioned upon the base and having a member movable within the cylinder, said member having one face constantly subjected to pressure fluid confined within the reservoir for moving the element to one of its positions, controlling means for directing fluid from the reservoir to an opposed face of the member for moving it to another position, said means controlling the exhaust from the element to the chamber, a wall within the chamber separating the exhaust inlet and outlet, a reinforcing wall within the chamber, and the last said wall serving to break up the exhaust in its-passage around the upstanding cylinder.

7. A drill sharpener comprising a fluid actuated work engaging element having a primary and a secondary pressure engaging area to perform different operations upon the work, a second fluid actuated work engaging element separate from the first and mounted thereupon, said second element coacting with the first in their joint performance of one operation, movable means controlling the flow of fluid to one of said areas and to both successively, an exhaust receiving chamber carried by the machine and receiving exhaust from both pressure areas of the first said element, and said exhaust when confined within said chamber assisting the first said element during its operation.

GUSTAV C. PEARSON. 

